here's the source of his comment. He does go on to
explain it in more detail:
http://catholicexchange.com/voting-for-pro-abortion-
candidates/

Answer by Judie Brown on 10/6/2012:

Linda

Your link does not work but ... there is every reason to believe CHAPUT nailed it whe
he said:

What is a “proportionate” reason when it comes to the abortion issue? It’s the kind
of reason we will be able to explain, with a clean heart, to the victims of abortion
when we meet them face to face in the next life–which we most certainly will. If
we’re confident that these victims will accept our motives as something more than
an alibi, then we can proceed.